Our unique latex formulation and dip manufacturing process delivers radical modulus strength. The power curve increases as bands are stretched for optimum performance. Special anti-oxidants help protect against harmful U.V. rays, prolonging sling life. Wishbones are made of 302 stainless wire and provide superior strength and durability. 200 series bands are the backbone of JBL Spearguns. They feature a 9/16" outer diameter and are the standard band for more JBL spearguns than any other sling diameter. They are also a great option for divers looking to refresh old bands on their speargun.